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主题:XMd3ZX = Nova M31 2017-07b 系外新星* FeII

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XMd3ZX = Nova M31 2017-07b 系外新星* FeII  发帖心情 Post By:2017-07-22 10:16:43

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https://wis-tns.weizmann.ac.il/object/2017fog
http://www.astronomerstelegram.org/?read=10596

TNS Astronomical Transient Report No. 12677

Date Received (UTC): 2017-07-20 09:15:21
Sender: Mr. Zhijian Xu
Source Group: XOSSv
Zhijian Xu, Xing Gao report/s the discovery of a new astronomical transient.

IAU Designation: AT 2017fog
Discoverer internal name: XMd3ZX
Coordinates (J2000): RA = 00:43:14.98 (10.812417) DEC = +41:20:49.80 (41.347167)
Discovery date: 2017-07-19 21:04:36 (JD=2457954.3781944)

Potential host galaxy: M31


Photometry

Discovery (first detection):
Discovery date: 2017-07-19 21:04:36
Flux: 18.4 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other
Remarks: Zhijian Xu(Nanjing, Jiangsu, China) and Xing Gao (Urumqi, Xinjiang, China) report the discovery of a possible nova in M31. The transient (mag approximately 18.4) on severl 40-s survey images (limiting mag about 19.0) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Jul. 19.87819 UT using a unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). The new object approximately located at R.A.=00h43m14.98s +41d20'49".8 (equinox 2000.0). Which is about 345.7" east and 281.3" north of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Jul 16.84425 (limiting mag 19.0). All images can be seen from: http://www.xjltp.com/XOSS/XMd3ZX/XMd3ZX.htm.

Last non-detection:
Last non-detection date: 2017-07-16 20:15:43
Limiting flux: 19 VegaMag
Filter: Clear-
Instrument: Other
Telescope: Other

Remarks: Using a unfiltered CCD + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9.

Details of the new object can be viewed here: https://wis-tns.weizmann.ac.il/object/2017fog

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Spectroscopic confirmation of PNV J00431504+4120506 as a classical nova

ATel #10596; E. A. Barsukova, A. F. Valeev (Special Astrophysical Observatory, Russia), V. P. Goranskij (SAI, Moscow University), M. Henze (IEEC/CSIC), A. W. Shafter (SDSU), K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic)
on 25 Jul 2017; 11:16 UT
Credential Certification: Barsukova E.A. (bars@sao.ru)

Subjects: Optical, Nova

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We report optical spectroscopy of the M31 nova candidate PNV J00431504+4120506 (AT2017fog, ATel #10588). The data were obtained on 2017 July 22.013 UT using the Russian BTA telescope equipped with the SCORPIO spectrograph. The total exposure was 1.5 ks. The spectra were taken with a spectral resolution of 4.7 ? in the spectral range of 4046 - 5841 ? and with the signal to noise ratio of 40. Photometry of the object was obtained before and immediately after the spectroscopy. The values of B = 16.70 ± 0.05, V = 16.57 ± 0.05, Rc = 16.46 ± 0.05. The spectrum has a blue continuum of a hot star. Hβ and Hγ lines have P Cyg profiles along with the following Fe II lines: 4128, 4179, 4233, 4303, 4924, 5018, 5169, 5198, 5235, 5276, 5317 ?. The heliocentric radial velocity of emission components of the P Cyg profiles equals to -200 km/s. The absorption minima are shifted from these emission maxima by 650 km/s to the blue side, while absorptions spread of 1000 km/s. We classified this nova as a Fe II class nova, in the system of Williams (1992), at maximum brightness.

The spectrum of the Nova

[此贴子已经被作者于2017-07-26 00:10:49编辑过]

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